解方程cot2y=0.25
回答 (2)
2014-01-01 7:05 am
✔ 最佳答案
...........0<y<4，解方程Cot(2y)=0.25，以弧度表示答案Sol
Tan(2y)=4
2y=nπ+ArcTan(4)=nπ+1.3258
0<nπ+1.3258<8
－1.3258<nπ<8－1.3258
－1.3258<nπ<6.6742
－0.422<n<2.124
n=0 or n=1 or n=2
2y=1.3258 or 2y=4.46739 or 2y=7.60898
y=0.6629 or y=2.233695 or y=3.80449
2014-01-01 6:59 am
As 1/tan2y=1/4
tan2y=4
2y=tan-1(4)
2y= 1.33, 1.33+Pi, 1.33+2Pi
=0.67, 2.24, 3.81
tan2y=4
2y=tan-1(4)
2y= 1.33, 1.33+Pi, 1.33+2Pi
=0.67, 2.24, 3.81
參考: ME
收錄日期: 2021-04-11 20:23:52
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https://hk.answers.yahoo.com/question/index?qid=20131231000051KK00212